Hi Richard, it is possible that you will need to do it incrementally but I would also like to suggest you taking a look into the BIOS release notes, especially the text in blue making reference to the memory.
Trying to install multiple times (think the 4th time) succeeded despite this being a brand new (from Amazon) box so I'm guessing I was running a very old BIOS.
This was to remove the thermal temp warnings at 45 degrees.
I had to click the "Restart and Install BIOS" about 5 times before it did it.
System rebooted and all good